1/10×57.07×〖0.2〗^2
    [1.2×(39+0.135+0.45+0.333)+1.4×(3.0+2.0+2.0)]
    2-√3
    √2×300×2244.2/(2*380.1*210)
    √2×500×1855/(2*380.1*210)
    4*78.5*210/(300*200)
    4*78.5*210/(440*200)
    197.78×636.83/(10×(2106.78-636.83) )
    7415.372×10^6/(19000×1973.3)
    2106.78-636.83+503.35
    140578606590.368225/279286872.335
    1/3×2050×（636.83）^3-1/3×(2050-300)×(636.83-242)^3
    1/2×2050×（636.83）^2-1/2×(2050-300)×(636.83-242)^2
    (√((10*0.030)^2+2*10*0.0300)-10*0.0300)*2106.78
    (√((10*0.0301)^2+2*10*0.0301)-10*0.0.0301)*2106.78
    19000/(2106.78*300)
    19000/(300*2100)
    2200-93.22
    (161.53×6+136.7×7+116×14+66.7×7+46×14)/50
    7415.372×10^6/(210*0.92*2100)

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